P03FD
Ignition L Control Signal Circuit/Open
Ignition L Control Signal Circuit/Open: the circuit is open. This line drives an ignition coil group; a fault causes misfire on those cylinders.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Open wire between PCM and coilCommon
- Pin pushed back out of connector bodyLess likely
- Cracked solder joint inside the module or sensorLess likely
Parts involved
- Ignition Coil
P03FD is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.